US5860483A - Method for installing electronic equipment below soft earth surface - Google Patents
Method for installing electronic equipment below soft earth surface Download PDFInfo
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- US5860483A US5860483A US08/968,911 US96891197A US5860483A US 5860483 A US5860483 A US 5860483A US 96891197 A US96891197 A US 96891197A US 5860483 A US5860483 A US 5860483A
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- 238000005553 drilling Methods 0.000 claims abstract description 37
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 12
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- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
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- 238000009933 burial Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000892 gravimetry Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000010076 replication Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
- E21B47/017—Protecting measuring instruments
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/107—Locating fluid leaks, intrusions or movements using acoustic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
- G01V1/181—Geophones
- G01V1/184—Multi-component geophones
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
- G01V1/52—Structural details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
- G01V11/002—Details, e.g. power supply systems for logging instruments, transmitting or recording data, specially adapted for well logging, also if the prospecting method is irrelevant
- G01V11/005—Devices for positioning logging sondes with respect to the borehole wall
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/61—Analysis by combining or comparing a seismic data set with other data
- G01V2210/612—Previously recorded data, e.g. time-lapse or 4D
Definitions
- This invention relates to vertical geological information gathering methods and apparatuses for the purpose of monitoring mineral production and exploration.
- One example of an earlier method entails drilling a production borehole, inserting a three-dimensional geophone instrument for data collection, and removing the instrument for mineral production from the borehole.
- a three-directional geophone is capable of detecting P waves and S waves. This allows for interpretation of: lithography, porosity, pore fluid type, pore shape, depth of burial consolidation, anisotropic changes in pressure, and anisotropic changes in temperature.
- production must cease and the instrument must be reinserted into the borehole.
- the position and coupling of the geophone receiver will not be the same as before and will, therefore, produce skewed data from that initially taken.
- this method detects both S and P waves, it is difficult to compare subsequent surveys because of different geophone positioning and coupling.
- a second example of an earlier method comprises deploying geophones at various locations on the surface and taking readings. Once the survey is completed, the receivers are retrieved for subsequent use at another survey project.
- the water and mud layer typically kill the S waves so that they do not propagate up into the mud or water where they could be received by seismic instruments positioned there. This is also true for the soft earth surface layer of land surveys.
- the data collected at the surface is not as accurate as data collected from deep within a borehole.
- the receivers must be re-deployed upon the surface. Again, the receivers are not likely to be positioned and coupled as in the first survey.
- a method for monitoring production mineral reservoirs comprises: permanently installing a geophone in a borehole; generating a first set of seismic waves; receiving a first set of seismic data with the geophone; recording the first set of data of said receiving a first set of seismic data; generating a second set of seismic waves after sufficient time has passed for conditions in the reservoir to have changed from the generating a first set of seismic waves; receiving a second set of seismic data with the geophone; and recording the second set of seismic data of said receiving a second set of seismic data.
- a method for installing instruments below the surface of the earth comprises: drilling a borehole with a drill apparatus; inserting an instrument in the borehole; and permanently fixing the instrument in the borehole.
- an instrument for receiving seismic data comprises: a geophone component which operates in an X-direction; a geophone component which operates in an Y-direction; a geophone component which operates in an Z-direction; and a housing for the geophone components which is permanently fixed in a borehole.
- a system for collecting seismic information comprises: a signal source; a signal receiver permanently fixed in a borehole; a control unit that sends and receives information to and from the signal source and the signal receiver; and communicators of data between the control unit and the signal receiver and the signal source.
- a method for monitoring production mineral reservoirs comprises: installing a pipe permanently in a borehole; lowering in a first instance an electronic instrument into the pipe; reading a first set of data with the electronic instrument; removing the electronic instrument from the pipe; lowering in a second instance the electronic instrument into the pipe after sufficient time has passed for conditions in the reservoir to have changed; and reading a second set of data with the electronic instrument.
- FIG. 1 is a cross-sectional view of an instrument in a vertical borehole
- FIG. 2 is an outline of a method for installing an instrument in a vertical borehole
- FIG. 3 is a cross-sectional view of a coil tube drilling apparatus
- FIG. 4a is a cross-sectional view of a seismic instrument for use in a vertical borehole
- FIG. 4b is a cross-sectional view of a seismic instrument for use in a vertical borehole
- FIG. 4c is a cross-sectional view of a seismic instrument for use in a vertical borehole
- FIG. 4d is a cross-sectional view of a seismic instrument for use in a vertical borehole
- FIG. 4e is a cross-sectional view in the Z axis direction of the instrument at the X-geophone;
- FIG. 4f is a cross-sectional view in the Z axis direction of the instrument at the Y-geophone;
- FIG. 4g is a cross-sectional view in the Z axis direction of the instrument at the Z-geophone;
- FIG. 5 is a diagram of a configuration of the instrument attached to a pipe for insertion in the borehole
- FIG. 6 is a diagram of a configuration of the instrument attached to a pipe for insertion in the borehole
- FIG. 7 is an outline of a method for monitoring a production reservoir
- FIG. 8 is a diagram of a configuration of the invention with an instrument attached to an exterior of the pipe and an instrument attached to an interior of the pipe;
- FIG. 9 is a diagram of a configuration of the invention with an upper section of the pipe removed.
- FIGS. 1 and 2 there is shown a cross-sectional view of a vertical seismic instrument well (1) and an outline of a method for installing the instrument.
- the method comprises drilling (201) a first section (2) of the well to a depth of about 50 feet.
- This first section (2) is relatively wider than deeper second section (3) of the well yet to be drilled.
- a larger diameter casing (10) (for example, 3.5 to 4.5 inches) is installed (202) in this first section (2).
- the space between the casing (10) and the earth is filled (203) with cement to permanently fix the casing (10) in position.
- a smaller diameter section (3) (for example, about 2.4 inches) is then drilled (204) below the larger diameter casing (10) to a depth of about 700 to 1000 feet (this depth could be much deeper given the particular environment surrounding the borehole).
- the drill string pipe that drilled the smaller diameter section is then removed from the hole.
- a seismic instrument (40) is then attached (205) to a pipe (30) or the original drill string pipe and either tabular member is inserted (206) into the well (1).
- the end of the pipe (30) extends nearly to the bottom of the well (1) and the instrument (40) is attached to the pipe (30) at a depth of about 300 to 400 feet (this depth may be changed according to the desired instrument configuration).
- the instruments may be fixed in the borehole by collapsing the borehole walls or by allowing the borehole walls to collapse on the instrument. At times this will provide superior coupling of the instrument to the surrounding formation because of the uniformity of material around the instrument.
- the drilling apparatus used to drill the borehole is coil tubing. As the cost of the drilling apparatuses become less expensive, it will be more efficient to attach the seismic instrument directly to the coil tube itself.
- the coil tube is then left in the borehole while the instruments are permanently fixed in the borehole. Concrete is pumped into the borehole through the coil tube so as to flow up and around the instruments as before.
- the drill bit and downhole motor are then permanently fixed in the borehole as well as the instruments. This method is preferred when it is less expensive to leave the drill apparatuses in the borehole rather than pull them out (for example, by collapsing the drill apparatus and removing it through the coil-tubing).
- a high pressure water nozzle is one type of drilling apparatus that may eventually become so inexpensive to merit leaving in the borehole.
- a coil tube drilling apparatus (310) is shown.
- the drill bit (301) is driven by a downhole motor (302).
- the downhole motor (302) is powered by mud pump pressure which is pumped by a pump (304) at the surface.
- a coil tube (305) connects the pump (304) to the downhole motor (302).
- the coil tube (305) is reeled off a tube spool (307) and over a wheel (308).
- the wheel (308) is positioned over the borehole (306) so that the coil tube (305) may extend from the wheel (308) and down into the borehole (306).
- a centralizer (309) and an electronic instrument (303) are attached to coil tubing (305).
- coil tube drilling apparatus 310) is the Fleet Model 40-20 Coiled Tubing Unit produced by Vita International, Inc. This unit has the following characteristics:
- Injector Head Rating Up to 40,000 lb.
- Braking System Main brake--Fail-safe wet type, Auxiliary brake-Band type-air actuated.
- Gripping System Lebus grooving with multiple hold-down rollers.
- Optional Equipment Winches, pumps, etc. per customer requirements.
- Tubing Reel Cradle Side frames are hydraulically opened to facilitate easy change out of reels.
- Item A Available installed in control cabin mounted on truck or trailer. Item A is available with 50' remote capability.
- a seismic instrument (401) for permanent fixation in a borehole as seen along a Y axis.
- the instrument (401) comprises three geophones: a X-geophone (402) positioned to read waves along an X axis, a Y-geophone (403) positioned to read waves along a Y axis, and a Z-geophone (404) positioned to read waves along a Z axis.
- a cable (405) runs through the instrument (401) for transmission of readings received by the geophones.
- the instrument (401) also has a water-tight housing structure (406) that seals the cable (405) and the geophones (402), (403) and (404) within.
- the cable (405) is itself sealed on the portions which extend out from the housing (406).
- the portions of the cable (405) in the interior of the housing (406) are at connection points which connect to the geophones.
- seals (407) are formed between the cable (405) and the housing (406) where the cable (405) enters the housing (406) at both ends.
- Interior seals (408) also form a water-tight barrier between the housing (406) and the cable (405).
- the cable (405) and housing (406) may be sealed with either glass, epoxy or O-rings depending on the particular application.
- a temperature instrument a pressure instrument, a hydrophone, a gravimetry resistance instrument, a resistivity instrument, an electromagnetic instrument, and a radiation sensing instrument.
- FIG. 4b there is depicted the housing (406) and the geophones (402), (403) and (404) as viewed along an X axis.
- FIG. 4c the housing (406) and geophones (402), (403) and (404) are shown as viewed along a Y axis.
- FIG. 4d the housing (405) and geophones (402), (403) and (404) are shown as viewed along a Y axis.
- FIG. 4e a cross section of the X-geophone (402) is shown as viewed along the Z axis.
- FIG. 4f the Y-geophone (403) is shown as viewed along the Z axis.
- the Z-geophone (404) is shown as viewed along the Z axis. Notice also in FIGS. 4e-4g there are holes (411), (412) and (413) in the housing (406).
- the cable (405) passes through and connects to each geophone in these holes.
- a configuration for attaching the instrument to the pipe or drill string is shown.
- a centralizer (501) is fixed to the pipe (502) which is used to insert the instrument (503).
- the centralizer comprises upper and lower collars (504) and bows (505) which extend between and connect the collars (504).
- the bows (505) are somewhat flexible and have a wider outside diameter than the collars (504) so that they can flex against the sides of the borehole to prevent the pipe from contacting the sides of the borehole.
- a cable (506) extends from both ends of the instrument (503) and is attached to the pipe (502) by the upper and lower collars (504). Additionally, the instrument (503) can be attached to the pipe (502) by wrapping waterproof tape around both the instrument (503) and the pipe (502).
- FIG. 6 a configuration for attaching the instrument to the pipe is shown.
- two centralizers (601) and (604) attach the cable (606) to the pipe (602).
- no centralizer encircles the instrument, but rather one centralizer is above (601) the instrument and the other below (604).
- the instrument (603) can be attached to the pipe (602) by wrapping waterproof tape around both the instrument (603) and the pipe (602).
- multiple instruments may be attached to a single pipe at various locations.
- Multiple centralizers may also be attached at various locations to keep the pipe from contacting the borehole sides.
- a centralizer could be attached every 10 feet, even where no instruments are attached.
- the method is to install a seismic instrument permanently in the substrata near the reservoir to be monitored. This is done by drilling (701) a borehole with a drill apparatus. Next, a seismic instrument, such as a three-dimensional geophone, is inserted (702) into the borehole. The instrument is then permanently fixed (703) in the borehole by filling the borehole with concrete. This not only fixes the position of the instrument in one location, but it couples the instrument to the substrata. Coupling enables the instrument to perceive seismic waves traveling through the strata because the instrument is actually attached to the strata. The next step in the method is to generate (704) a first set of seismic waves.
- the seismic source may also be placed in a borehole adjacent to the borehole for the receiver instruments. This allows the seismic wave to travel from the seismic source, down into the lower strata, be reflected back up toward the surface, and be received by the receiver instruments without travelling through an S-wave killing, soft earth, surface layer.
- FIG. 8 there is shown a configuration of the instruments placed within the borehole.
- an instrument (40) is attached to the exterior of the pipe (30).
- the pipe (30) is inserted into the borehole so that the instrument (40) is about half way down the borehole.
- the pipe (30) is permanently fixed in the borehole by pumping concrete down the center of the pipe (30) so that the concrete comes out a hole (31) in the bottom of the pipe (30).
- the concrete then rises in the borehole (3) between the pipe (30) and the borehole walls so that it surrounds the instrument (40).
- a plug (60) is then used to push the concrete down the pipe so that interior of the pipe above the plug (60) is not filled with concrete.
- a second instrument (50) is then placed down in the interior of the pipe for readings. This instrument (50) may be retrieved and reinserted each time readings are desired.
- a similar embodiment of the invention is to install the pipe without attaching an instrument (40) to the outside of the pipe (30).
- the cement is still removed from the interior of the pipe (30) by the plug (60).
- no instruments are permanently fixed in the borehole. Rather, instruments are lowered into the pipe for taking readings. Once the readings are taken, the instruments are removed for use at other locations. Each time readings need to be taken, the instruments are simply lowered again into the pipe.
- FIG. 9 there is shown a diagram of a configuration for installing the instruments below the soft earth surface layer.
- the instrument (40) is attached to the exterior of the pipe (30) and the space between the pipe (30) and the borehole walls is filled with concrete as well as the inside of the pipe (30).
- Particular to this embodiment is the detachment of the upper portion of the pipe (30).
- the pipe (30) and borehole (3) are covered over with earth. This keeps the top of the pipe (30) from acting like an antenna by insulating the instrument from vibrations generated at and above the surface of the earth. These vibrations tend to interfere with the seismic reading being obtained by the instruments.
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Abstract
A method for monitoring production mineral reservoirs, the method comprising: permanently installing a geophone in a borehole; generating a first set of seismic waves; receiving a first set of seismic data with the geophone; recording the first set of data of said receiving a first set of seismic data; generating a second set of seismic waves after sufficient time has passed for conditions in the reservoir to have changed from the generating a first set of seismic waves; receiving a second set of seismic data with the geophone; and recording the second set of seismic data of said receiving a second set of seismic data. A method for installing instruments below the surface of the earth, the method comprising: drilling a borehole with a drill apparatus; inserting an instrument in the borehole; and permanently fixing the instrument in the borehole. An instrument for receiving seismic data, the instrument comprising: a geophone component which operates in an X-direction; a geophone component which operates in an Y-direction; a geophone component which operates in an Z-direction; and a housing for the geophone components which is permanently fixed in a borehole.
Description
This application is a continuation of application Ser. No. 08/544,734 filed Oct. 18, 1995, now abandoned.
This invention relates to vertical geological information gathering methods and apparatuses for the purpose of monitoring mineral production and exploration.
As the value of oil and gas has continued to rise, there has been increasing interest in methods for effectively retrieving all minerals from known mineral deposits and for discovering new reservoirs. Information about the rate of depletion and the migration of minerals within a mineral reservoir allow operators to apply the most effective production techniques to the particular reservoir conditions. Accurate monitoring of mineral depletion from a given reservoir requires replication of accurate surveys over a long period of time. Also, because differently placed and coupled receivers provide altered results, the seismic receivers need to be placed and coupled similarly for surveys conducted at different times.
One example of an earlier method entails drilling a production borehole, inserting a three-dimensional geophone instrument for data collection, and removing the instrument for mineral production from the borehole. A three-directional geophone is capable of detecting P waves and S waves. This allows for interpretation of: lithography, porosity, pore fluid type, pore shape, depth of burial consolidation, anisotropic changes in pressure, and anisotropic changes in temperature. However, if subsequent readings are to be obtained, production must cease and the instrument must be reinserted into the borehole. The position and coupling of the geophone receiver will not be the same as before and will, therefore, produce skewed data from that initially taken. Thus, even though this method detects both S and P waves, it is difficult to compare subsequent surveys because of different geophone positioning and coupling.
A second example of an earlier method comprises deploying geophones at various locations on the surface and taking readings. Once the survey is completed, the receivers are retrieved for subsequent use at another survey project. In an ocean survey, the water and mud layer typically kill the S waves so that they do not propagate up into the mud or water where they could be received by seismic instruments positioned there. This is also true for the soft earth surface layer of land surveys. Thus, the data collected at the surface is not as accurate as data collected from deep within a borehole. Also, like the previous method, if survey data is to be collected at a later time, the receivers must be re-deployed upon the surface. Again, the receivers are not likely to be positioned and coupled as in the first survey.
Therefore, in order to provide accurate surveys of reservoirs over time, there is a need for repeatability in the location of seismic receivers and in detection of both S-wave and P-wave signals.
According to one aspect of the invention, there is provided a method for monitoring production mineral reservoirs. One embodiment of this aspect comprises: permanently installing a geophone in a borehole; generating a first set of seismic waves; receiving a first set of seismic data with the geophone; recording the first set of data of said receiving a first set of seismic data; generating a second set of seismic waves after sufficient time has passed for conditions in the reservoir to have changed from the generating a first set of seismic waves; receiving a second set of seismic data with the geophone; and recording the second set of seismic data of said receiving a second set of seismic data.
According to another aspect of the invention, there is provided a method for installing instruments below the surface of the earth. One embodiment of this aspect comprises: drilling a borehole with a drill apparatus; inserting an instrument in the borehole; and permanently fixing the instrument in the borehole.
According to a further aspect of the invention, there is provided an instrument for receiving seismic data. One embodiment of the aspect comprises: a geophone component which operates in an X-direction; a geophone component which operates in an Y-direction; a geophone component which operates in an Z-direction; and a housing for the geophone components which is permanently fixed in a borehole.
According to a further aspect of the invention, there is provided a system for collecting seismic information. One embodiment of this aspect comprises: a signal source; a signal receiver permanently fixed in a borehole; a control unit that sends and receives information to and from the signal source and the signal receiver; and communicators of data between the control unit and the signal receiver and the signal source.
According to a still further aspect of the invention, there is provided a method for monitoring production mineral reservoirs. One embodiment comprises: installing a pipe permanently in a borehole; lowering in a first instance an electronic instrument into the pipe; reading a first set of data with the electronic instrument; removing the electronic instrument from the pipe; lowering in a second instance the electronic instrument into the pipe after sufficient time has passed for conditions in the reservoir to have changed; and reading a second set of data with the electronic instrument.
The present invention is better understood by reading the following description of nonlimitative embodiments with reference to the attached drawings, wherein like parts in each of the several figures are identified by the same reference character, which are briefly described as follows:
FIG. 1 is a cross-sectional view of an instrument in a vertical borehole;
FIG. 2 is an outline of a method for installing an instrument in a vertical borehole;
FIG. 3 is a cross-sectional view of a coil tube drilling apparatus;
FIG. 4a is a cross-sectional view of a seismic instrument for use in a vertical borehole;
FIG. 4b is a cross-sectional view of a seismic instrument for use in a vertical borehole;
FIG. 4c is a cross-sectional view of a seismic instrument for use in a vertical borehole;
FIG. 4d is a cross-sectional view of a seismic instrument for use in a vertical borehole;
FIG. 4e is a cross-sectional view in the Z axis direction of the instrument at the X-geophone;
FIG. 4f is a cross-sectional view in the Z axis direction of the instrument at the Y-geophone;
FIG. 4g is a cross-sectional view in the Z axis direction of the instrument at the Z-geophone;
FIG. 5 is a diagram of a configuration of the instrument attached to a pipe for insertion in the borehole;
FIG. 6 is a diagram of a configuration of the instrument attached to a pipe for insertion in the borehole;
FIG. 7 is an outline of a method for monitoring a production reservoir;
FIG. 8 is a diagram of a configuration of the invention with an instrument attached to an exterior of the pipe and an instrument attached to an interior of the pipe; and
FIG. 9 is a diagram of a configuration of the invention with an upper section of the pipe removed.
It is to be noted, however, that the appended drawings illustrate only typical embodiments of the invention and are therefore not to be considered a limitation of the scope of the invention which includes other equally effective embodiments.
Referring to FIGS. 1 and 2, there is shown a cross-sectional view of a vertical seismic instrument well (1) and an outline of a method for installing the instrument. The method comprises drilling (201) a first section (2) of the well to a depth of about 50 feet. This first section (2) is relatively wider than deeper second section (3) of the well yet to be drilled. A larger diameter casing (10) (for example, 3.5 to 4.5 inches) is installed (202) in this first section (2). The space between the casing (10) and the earth is filled (203) with cement to permanently fix the casing (10) in position. A smaller diameter section (3) (for example, about 2.4 inches) is then drilled (204) below the larger diameter casing (10) to a depth of about 700 to 1000 feet (this depth could be much deeper given the particular environment surrounding the borehole). The drill string pipe that drilled the smaller diameter section is then removed from the hole. A seismic instrument (40) is then attached (205) to a pipe (30) or the original drill string pipe and either tabular member is inserted (206) into the well (1). The end of the pipe (30) extends nearly to the bottom of the well (1) and the instrument (40) is attached to the pipe (30) at a depth of about 300 to 400 feet (this depth may be changed according to the desired instrument configuration). Cement is then pumped (207) into the pipe (30) so that it flows down the pipe (30) and out a hole (31) at the bottom. The concrete first fills the space between the pipe (30) and the smaller diameter section (3) and encircles the instruments (40). Finally, the concrete fills the space between the pipe (30) and the larger diameter casing (10). Once the concrete sets, the instrument (40) is permanently fixed in the well (1). Instruments may be installed in this way both on land and offshore.
In some environments, the instruments may be fixed in the borehole by collapsing the borehole walls or by allowing the borehole walls to collapse on the instrument. At times this will provide superior coupling of the instrument to the surrounding formation because of the uniformity of material around the instrument.
In some embodiments of the invention, the drilling apparatus used to drill the borehole is coil tubing. As the cost of the drilling apparatuses become less expensive, it will be more efficient to attach the seismic instrument directly to the coil tube itself. The coil tube is then left in the borehole while the instruments are permanently fixed in the borehole. Concrete is pumped into the borehole through the coil tube so as to flow up and around the instruments as before. The drill bit and downhole motor are then permanently fixed in the borehole as well as the instruments. This method is preferred when it is less expensive to leave the drill apparatuses in the borehole rather than pull them out (for example, by collapsing the drill apparatus and removing it through the coil-tubing). A high pressure water nozzle is one type of drilling apparatus that may eventually become so inexpensive to merit leaving in the borehole.
Referring to FIG. 3, a coil tube drilling apparatus (310) is shown. The drill bit (301) is driven by a downhole motor (302). The downhole motor (302) is powered by mud pump pressure which is pumped by a pump (304) at the surface. A coil tube (305) connects the pump (304) to the downhole motor (302). As the borehole (306) is drilled deeper, the coil tube (305) is reeled off a tube spool (307) and over a wheel (308). The wheel (308) is positioned over the borehole (306) so that the coil tube (305) may extend from the wheel (308) and down into the borehole (306). In some embodiments, a centralizer (309) and an electronic instrument (303) are attached to coil tubing (305).
One example of the coil tube drilling apparatus (310) is the Fleet Model 40-20 Coiled Tubing Unit produced by Vita International, Inc. This unit has the following characteristics:
Injector Head Rating: Up to 40,000 lb.
Drive: Hydrostatic powered planetary to sprocket & chain final drive.
Speed: 220 Ft. Max.
Braking System: Main brake--Fail-safe wet type, Auxiliary brake-Band type-air actuated.
Straightener: Manual/hydraulic system.
Gripping System: Lebus grooving with multiple hold-down rollers.
Size Range: To 31/2".
Truck, trailer, skid mounted.
Hydraulic leveling and centering.
Mast: Up to 30 Ft. for wellhead clearance with capability for self-loading/unloading of storage/work reel.
Optional Equipment: Winches, pumps, etc. per customer requirements.
Power Equipment: Up to 200 HP Diesel.
Hydraulics: Injector and Storage/Work Reels--Sunstrand Hydrostatic, Max Pressure--5000 PSI.
Leveling, raising, winding and lateral positioning: Conventional gear type pump with max pressure--3000 PSI.
______________________________________ Storage/Work Reel Flange Dia: 120" Tubing O.D. Core Diameter Capacity ______________________________________ 23/8" 96" 3,000 Ft. 2" 80" 7,000 Ft. 13/4" 72" 9,600 Ft. 11/2" 72" 14,000 Ft. 11/4" 72" 19,000 Ft. 1" 72" 30,000 Ft. ______________________________________
Tubing Reel Cradle: Side frames are hydraulically opened to facilitate easy change out of reels.
Controls:
A. Electric over hydraulic for injector reel; storage reel and traverse (winding).
B. Conventional for raising, leveling, centering, winches, etc.
Available installed in control cabin mounted on truck or trailer. Item A is available with 50' remote capability.
Referring to FIG. 4a, there is a seismic instrument (401) for permanent fixation in a borehole as seen along a Y axis. The instrument (401) comprises three geophones: a X-geophone (402) positioned to read waves along an X axis, a Y-geophone (403) positioned to read waves along a Y axis, and a Z-geophone (404) positioned to read waves along a Z axis. A cable (405) runs through the instrument (401) for transmission of readings received by the geophones. The instrument (401) also has a water-tight housing structure (406) that seals the cable (405) and the geophones (402), (403) and (404) within. The cable (405) is itself sealed on the portions which extend out from the housing (406). The portions of the cable (405) in the interior of the housing (406) are at connection points which connect to the geophones. Thus, in order to maintain a water-tight barrier for the entire instrument (401), seals (407) are formed between the cable (405) and the housing (406) where the cable (405) enters the housing (406) at both ends. Interior seals (408) also form a water-tight barrier between the housing (406) and the cable (405). The cable (405) and housing (406) may be sealed with either glass, epoxy or O-rings depending on the particular application.
Other types of instruments are also possible. These include: a temperature instrument, a pressure instrument, a hydrophone, a gravimetry resistance instrument, a resistivity instrument, an electromagnetic instrument, and a radiation sensing instrument.
Referring to FIG. 4b, there is depicted the housing (406) and the geophones (402), (403) and (404) as viewed along an X axis. Referring to FIG. 4c, the housing (406) and geophones (402), (403) and (404) are shown as viewed along a Y axis. Referring to FIG. 4d, the housing (405) and geophones (402), (403) and (404) are shown as viewed along a Y axis. In FIG. 4e, a cross section of the X-geophone (402) is shown as viewed along the Z axis. In FIG. 4f, the Y-geophone (403) is shown as viewed along the Z axis. In FIG. 4g, the Z-geophone (404) is shown as viewed along the Z axis. Notice also in FIGS. 4e-4g there are holes (411), (412) and (413) in the housing (406). The cable (405) passes through and connects to each geophone in these holes.
Referring to FIG. 5, a configuration for attaching the instrument to the pipe or drill string is shown. In this configuration, a centralizer (501) is fixed to the pipe (502) which is used to insert the instrument (503). The centralizer comprises upper and lower collars (504) and bows (505) which extend between and connect the collars (504). The bows (505) are somewhat flexible and have a wider outside diameter than the collars (504) so that they can flex against the sides of the borehole to prevent the pipe from contacting the sides of the borehole. A cable (506) extends from both ends of the instrument (503) and is attached to the pipe (502) by the upper and lower collars (504). Additionally, the instrument (503) can be attached to the pipe (502) by wrapping waterproof tape around both the instrument (503) and the pipe (502).
Referring to FIG. 6, a configuration for attaching the instrument to the pipe is shown. In this configuration, two centralizers (601) and (604) attach the cable (606) to the pipe (602). Here, no centralizer encircles the instrument, but rather one centralizer is above (601) the instrument and the other below (604). Again, the instrument (603) can be attached to the pipe (602) by wrapping waterproof tape around both the instrument (603) and the pipe (602).
Also, it should be understood that multiple instruments may be attached to a single pipe at various locations. Multiple centralizers may also be attached at various locations to keep the pipe from contacting the borehole sides. A centralizer could be attached every 10 feet, even where no instruments are attached.
Referring to FIG. 7, there is shown a method for monitoring a production mineral reservoir. The method is to install a seismic instrument permanently in the substrata near the reservoir to be monitored. This is done by drilling (701) a borehole with a drill apparatus. Next, a seismic instrument, such as a three-dimensional geophone, is inserted (702) into the borehole. The instrument is then permanently fixed (703) in the borehole by filling the borehole with concrete. This not only fixes the position of the instrument in one location, but it couples the instrument to the substrata. Coupling enables the instrument to perceive seismic waves traveling through the strata because the instrument is actually attached to the strata. The next step in the method is to generate (704) a first set of seismic waves. These waves are reflected in the strata and are received (705) by the instrument. This data is recorded (706) so that mineral producers will have knowledge of reservoir conditions at that point in time. Later, a second set of seismic waves are generated (707). These waves again are reflected in the strata and are received (708) by the instrument. This second set of data is also recorded (709) for comparison with the first set of data.
In this method, the seismic source may also be placed in a borehole adjacent to the borehole for the receiver instruments. This allows the seismic wave to travel from the seismic source, down into the lower strata, be reflected back up toward the surface, and be received by the receiver instruments without travelling through an S-wave killing, soft earth, surface layer.
Referring to FIG. 8, there is shown a configuration of the instruments placed within the borehole. In this embodiment an instrument (40) is attached to the exterior of the pipe (30). The pipe (30) is inserted into the borehole so that the instrument (40) is about half way down the borehole. The pipe (30) is permanently fixed in the borehole by pumping concrete down the center of the pipe (30) so that the concrete comes out a hole (31) in the bottom of the pipe (30). The concrete then rises in the borehole (3) between the pipe (30) and the borehole walls so that it surrounds the instrument (40). A plug (60) is then used to push the concrete down the pipe so that interior of the pipe above the plug (60) is not filled with concrete. A second instrument (50) is then placed down in the interior of the pipe for readings. This instrument (50) may be retrieved and reinserted each time readings are desired.
A similar embodiment of the invention is to install the pipe without attaching an instrument (40) to the outside of the pipe (30). The cement is still removed from the interior of the pipe (30) by the plug (60). In this embodiment, no instruments are permanently fixed in the borehole. Rather, instruments are lowered into the pipe for taking readings. Once the readings are taken, the instruments are removed for use at other locations. Each time readings need to be taken, the instruments are simply lowered again into the pipe.
Referring to FIG. 9, there is shown a diagram of a configuration for installing the instruments below the soft earth surface layer. In this configuration, the instrument (40) is attached to the exterior of the pipe (30) and the space between the pipe (30) and the borehole walls is filled with concrete as well as the inside of the pipe (30). Particular to this embodiment is the detachment of the upper portion of the pipe (30). The pipe (30) and borehole (3) are covered over with earth. This keeps the top of the pipe (30) from acting like an antenna by insulating the instrument from vibrations generated at and above the surface of the earth. These vibrations tend to interfere with the seismic reading being obtained by the instruments.
It is to be noted that the above described embodiments illustrate only typical embodiments of the invention and are therefore not to be considered a limitation of the scope of the invention which includes other equally effective embodiments.
Claims (29)
1. A method for installing an electronic instrument below the surface of the earth, the method comprising:
drilling an uncaused hole with a drill having a means for drilling attached at one end of the drill string;
fixing the drill string in the uncased hole, the drill string having attached thereto, on the outside of the drill string, the electronic instrument.
2. A method as in claim 1 wherein said drilling comprises drilling with a drill string comprising coil-tubing.
3. A method as in claim 2 wherein said means for drilling comprises a drill bit.
4. A method as in claim 2 wherein said means for drilling comprises a jet.
5. A method as in claim 1 wherein said means for drilling comprises a drill bit.
6. A method as in claim 1 wherein said means for drilling comprises a jet.
7. A method as in claim 1 wherein said fixing comprises collapsing the uncased hole around the drill string.
8. A method as in claim 7 wherein said drilling comprises drilling with a drill string comprising coil-tubing.
9. A method as in claim 8 wherein said means for drilling comprises a drill bit.
10. A method as in claim 8 wherein said means for drilling comprises a jet.
11. A method as in claim 1 wherein said fixing comprises cementing the drill string in the uncased hole.
12. A method as in claim 11 wherein said drilling comprises drilling with a drill string comprising coil-tubing.
13. A method as in claim 12 wherein said means for drilling comprises a drill bit.
14. A method as in claim 12 wherein said means for drilling comprises a jet.
15. A method as in claim 1 further comprising removing the means for drilling from the uncased hole.
16. A method as in claim 15 wherein said removing comprises:
removing the drill string from the hole;
removing the means for drilling from the drill string;
and wherein said method further comprises:
reinserting of the drill string into the hole.
17. A method as in claim 16 wherein said drill string comprises coil-tubing.
18. A method as in claim 17 wherein said fixing comprises collapsing the uncased hole on the drill string.
19. A method as in claim 17 wherein said fixing comprises cementing the drill string in the uncased hole.
20. A method as in claim 15 wherein said removing comprises removing of the means for drilling from the hole without removal of the drill string.
21. A method as in claim 1 wherein said fixing comprises fixing the drill string in the hole with the means for drilling attached to the drill string.
22. A method as in claim 1 wherein said drilling comprises drilling the hole with the instrument attached to the outside of the drill string.
23. A method as in claim 22 wherein said drilling comprises drilling with a drill string comprising coil-tubing.
24. A method as in claim 23 wherein said fixing comprises collapsing the uncased hole around the coil-tubing drill string.
25. A method as in claim 23 wherein said fixing comprises cementing the coil-tubing drill string in the uncased hole.
26. A method as in claim 23 wherein said means for drilling comprises a drill bit.
27. A method as in claim 23 wherein said means for drilling comprises a jet.
28. A method as in claim 22 wherein said fixing comprises collapsing the uncased hole around the drill string.
29. A method as in claim 22 wherein said fixing comprises cementing the drill string in the hole.
Priority Applications (2)
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US09/170,413 US6325161B1 (en) | 1995-05-24 | 1998-10-13 | Method and apparatus for installing electronic equipment below soft earth surface layer |
Applications Claiming Priority (4)
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NO952072 | 1995-05-24 | ||
NO952072A NO301674B1 (en) | 1995-05-24 | 1995-05-24 | Procedure for installing one or more instrument units |
US54473495A | 1995-10-18 | 1995-10-18 | |
US08/968,911 US5860483A (en) | 1995-05-24 | 1997-11-06 | Method for installing electronic equipment below soft earth surface |
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US08/889,697 Expired - Lifetime US5892733A (en) | 1995-05-24 | 1997-07-08 | Method and apparatus for installing electronic equipment below soft earth surface layer |
US08/968,911 Expired - Fee Related US5860483A (en) | 1995-05-24 | 1997-11-06 | Method for installing electronic equipment below soft earth surface |
US09/170,413 Expired - Lifetime US6325161B1 (en) | 1995-05-24 | 1998-10-13 | Method and apparatus for installing electronic equipment below soft earth surface layer |
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US08/889,697 Expired - Lifetime US5892733A (en) | 1995-05-24 | 1997-07-08 | Method and apparatus for installing electronic equipment below soft earth surface layer |
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Also Published As
Publication number | Publication date |
---|---|
NO952072L (en) | 1996-11-25 |
US5892733A (en) | 1999-04-06 |
US5979588A (en) | 1999-11-09 |
US6325161B1 (en) | 2001-12-04 |
NO952072D0 (en) | 1995-05-24 |
US5947199A (en) | 1999-09-07 |
NO301674B1 (en) | 1997-11-24 |
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